Most features about RAID tell you what RAID is and then help you to decide whether or not you need RAID in your PC or workstation. We could easily follow the same path and do no more than quickly run through the different types of RAID. But then we're going to throw out the rulebook and throw a spanner in the works as, to paraphrase our Prime Minister, "The rules have changed", though he admittedly wasn't talking about PCs. Yes, we've going to talk about each type of RAID but we're going to follow this with some exhaustive test results to back things up.